a terrible buisness, which banks on poor women and men, usually not the beatuiful sophisticated people you seee in movies, but homeless, abused, or without anything, and prostitution is the only way they live or know how to live.

Prostitution, n. The act of selling sex and/or sexual favours in exchange for money, drugs, or chickens, depending on local currency and exchange rates.
Illegal in nearly all countries worldwide. Politicians put it down at every opportunity, despite their frequent use of these "ladies of the night"
The most frightening aspect of prostitution is not the act, which is merely pornographic movies without the studio and piss-poor acting. The money from prostitution usually finances drug pushers, who in turn finance other criminal acts. Thus you paying to get your rocks off with some drug-addled whore in Soho could be indirectly funding things like 7/11 or even 9/11.
It is the oldest profession in the world.

Single man, driving in car: Hey babe, fancy showing me a good time?
Lady of negotiable affection: S'gonna cost ya.
Single man: Sure, I just wanna blow my load.
He gets what he wants, she gets what she wants. He probably gets a veneral disease too but hey, we can't all be winners.
This is the lowest form of prostitution.